My Phillips sonicare toothbrush will light up when on charger and after I remove it, but then when I press the power button, it shuts off

Charging

Are you sure the brush attachment is "tight" to the handle? Do you have a new brush to try? It should confirm handle is bad or it is the brush attachment "tightness" .

maybe the battery

Probably two reasons for this. 1) the contacts at the base of the brush are not clean which will prevent proper charging , the low battery beep is telling you to recharge.2) the battery needs replacing.

Take a look at this video from YouTube; hopefully it will help you to remove the battery from your philips toothbrush.Good luck
http://www.youtube.com/watch?v=UdWX155Kmq8

This happened to me as well. One long, two short beeps. Incessantly. Only happens when brush is on the charger.

Try this simple fix first. Hold down the SILVER button for 5 seconds while the toothbrush is on the charging base. If the fix works, it will fix the problem immediately like magic.

If that doesn't work, try this:
1) remove brushhead.
2) use screwdriver in the base and turn 1/4 turn
3) push out assembly from the top
4) dry the inside of of the base handle. allow to air dry
5) allow the switch to air dry
6) reassemble

Turn it on and put it on the charger while still on. This should turn off toothbrush. And it stopped the blinking!

The best tutorial for repairing Sonicare toothbrushes is here:
Repairing your Sonicare
The problem is either a corroded circuit board or worn-out Ni-Cad batteries. Both repair solutions require soldering, but full repair is possible.

I had mine for many, many years without a problem. I bought mine directly from them when they were first starting up, before they started advertising.
There's no easy fix as the internal electronics have gone kapute. Before pitching the unit for a new one, contact Sonicare and see if they will be willing to work with you by replacing it for a discount.

If not, the Oral-B is FAR superior product and is the only type I see recommended by dentists. Really made a difference over the Sonicare.

Both are highly rated however. Ask your dentist for his opinion.

2018 reiview:
Best Electric Toothbrush Reviews of 2018 Reviews com